Method of making coil-springs.



N0.s73,429. l PATBNTED DEc.1o,-19o7. N, s. HARTER.

METHOD 0F MAKINGCOIL SPRINGS. APPLmATlolsr FILED MAY a. 1901.

INVENTGR WITN ESSES UNITED sTATEs PATENT oEEIeE.

Y NOAH S. HARTER, OF WAUKEGAN, ILLINOIS, ASSIGNOR TO' AMERICAN STEEL &WIRE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

METHOD OF MAKING (JOIIL-SIEIR'IINGrS.

Specification of Letters Patent.

Patented Dee. 10, 1907.

Application filed May 6. 1907. Serial No. 372.005-

To all whom it may concern:

Be it known that I, NOAH S. HARTER, of

l Waukegan, Lake county, Illinois, have invented a new and useful Methodof Makingv Coil-Springs, of which the following is a full, clear, andexact description, reference being had to the accompanying drawing,forming part of this specification, in which the figure is a perspectiveview illustrating one form of apparatus for carrying out my invention.

In the manufacture of open coil springs heretofore, it has been thepractice `to press the coils together after the spring has been wound orcoiled for the purpose of giving the spring a permanent set. A springcoiled in the ordinary manner will not resu me its original length afterit has been compressed to its minimum length, but will be materiallydecreased in both pitch and length by such compression. set of thespring; and after this has once been effected, the vspring whensubsequently compressed will, when released, resulne approximately thelength and pitch effected by the first compression or set.

The object of the present invention is to provide a method whereby thesprings are given a set at the time they are wound or coiled, or as theypass out from the coiling mechanism.

' The invention may be carried out in various ways and by thc'use ofvarious forms of coiling mechanisms. In the accompanying drawing, I haveillustrated one way of performing the same. i

In this drawing, the numerals 2 and 3 designate a pair of pcripherallygrooved feed wheels, which may be driven in any desired manner.mountedin an adjustable bearing 4, having an adjustable setting screw 5by means of which its position relative to the wheel 3 may be adjustedto regulate the feeding pressure of said wheels. From these wheels, thewire passes through any suitable guide 6', and is coiled on the arbor ormandrel 7. The wire, being tightlyv clamped between the Wheels 2 and 3,is forced through the guide 6 and around the arboror mandrel, beingasadjacent to the mandrel.

This decrease constitutes the` pitch in excess of the desired .open coilsprings, The upper Wheel 2 is preferablyv 8 designatesia suitable toolwhich is ad-V justably secured inasupport 9, and which has a bevelednose 10 adjacent to the arbor in position to guide the wire to the same.This tool governs the pitch of the spring; and by turning it in itssupport 9 to vary the angle of the guiding face o its nose 10, the pitchmay be changed as desired. 11 designates a second tool, -also adjustablysecured in the support 9, and having a nose portion 12 which is adjacentto the nose 10, and in position to bear against the outer side of thesecond turn or coil of Wire on the arbor and press said coil backclosely against the first coil, thereby imparting a set to said secondcoil. In this manner, each coil is successively given a set after it iswound. By this method, I eliminate one operation and. also' the handlingconsequent thereto, it having been the praetice heretofore to coil thesprings on one machine, and then transfer them to another i where theset is given.

, My invention is -applicable to the manu facture of all kinds ofAopen-coil springs whether of the spiral type, or of the furniture springtype, and may be carried out with various forms of apparatus.

What I claim isz- 1. The method of forming helical springs,

which consists in forming Wire into a series of it is formed a itch, andthen pressing each coil backwar y against the following coil to removethe excess pitch and give a permanent set thereto; substantially asdescribed.

2. The herein described method of forming which consists in Winding orceiling a piece of wire to form coils of a certain pitch, and pressingeach coil backwardly against va later coil to remove excess itch andgive a permanent set; substantial y as described.

In testimony'whereof, I have hereunto set my hand.

coils, .imparting to each coil as NOAH S. HARTER.

Witnesses:

Jar WALDECK, F. T. PULSE.

